The Amino-Acid Sequence of S-100 Protein (PAP I-b Protein) and Its Relation to the Calcium-Binding Proteins.

The amino acid sequence of a brain-specific protein, S-100, has been determined by the analysis of four cyanogen bromide peptides and fourteen tryptic peptides derived from the protein. The protein chain consists of 91 amino acid residues and has a molecular weight of 10 507. The sequence shows regions of strong clustering of hydrophobic, basic and acidic amino acids, with an apparent calcium-binding site in the acidic cluster. [ABSTRACT FROM AUTHOR]